The Magnetic Field Due to Two Wires

Explains how to find the magnetic field due to multiple wires. This is at the AP Physics level. (Important note: at 5:00 the second fraction should have a denominator of (2pi)d, NOT just d.
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[@adityamohanty9474]

thanks man...you teach better than any of my teachers(no disrespect to them), you'r awesome

[@michaelhixson622]

6:00 - 6:04 By the right hand rule, you use the same direction for current and say that one is going into the page and the other field is going out of the page, but your fingers are pointing out of the page for both lines yet the claim is that the first field vector goes out of the page while the field vector for the second current goes into the page. Why does the right hand rule look the same for both?

[@richlawton1995]

Michael Hixson Its because of the position at which hes trying to work out the field. Because he's taking the point in the middle, if you think about the left wire, as he curls his hand, the fingers on the right hand side of the wire a coming out of the page. Whereas if you look at the right wire, the point is now to the left of the wire so you can see the base of his fingers are going into the page. Like if you were to draw the mag field as a circle, then at one side of the circle you'd have the arrows pointing out the page and on the other the arrows would point in. Basically its because the midpoint between the two wires is to the right of the first wire and to the left of the second if that makes sense. Just look more closely at how his fingers are curled and you should see it :)

[@seedwolfmgo247]

Michael Hixson that was a good question, thought the same. Thanks

[@markcedricalonzobalidoy8815]

Depends on the perspective in viewing, im confused really at first. But when i tried it you should learn where is the field going in the page while the other out of page. In right hand rule, direction is counter clockwise when facing north electric current but if you view it in different angles, it may look clockwise too but based it on the front side of the wire and you will get it. Just sharing

[@CamiloTiVo]

my wrist hurts from doing the right hand rule so much

[@RajinderSingh-rl1by]

@Bassant Mahmoud lol the left hand rule too!!

[@misseon1]

and wrestle with this angles

[@gamingmonts9737]

0:33 I just LOVE those sound effects 😂😂 great tutorials

[@GunZTube1]

I learned more from you than my prof

[@stewartbrown8066]

at 5:00 or 5:01 shouldn't the equation be B=mu naught * I_1/2pi(2d) + mu naught * I_2 / 2pi(d)...? Please correct me if I'm wrong.

[@abumuhd20]

I also think that is 2pid for the second current

[@nooralmubarak5164]

Stewart Brown I think so too

[@catsperloyd1690]

Both the vectors are in same direction.. so plus mu naught

[@chasmurphy1227]

I was just about to ask that, and I think you are correct. Just because in the next example, he has 2pi in both denominators

[@brendawilliams8062]

The easiest thing I can think of is 100216. Keep squaring and roll it on.

[@EmpyreanLightASMR]

This is like a physics lesson from a subdued Norm Macdonald. You even say "well, gosh" at 2:01. (But for real, this video answered my question!)

[@mechikaboombayah4960]

You teach Awesome Just go on teaching like this Sir #LoveAndRespect From INDIA😊😊

[@kabandajamir9844]

The world's best teacher thanks sir

[@quenz9709]

OMG THANK YOU SO MUCH! HAVE BEEN SEARCHING FOR THIS

[@tanri_kurtulusu]

My teacher taught us with a very similar method but I couldn't get a thing. Thank you very much with the help of this video I feel like I can answer every single question my teacher gonna ask me

[@richardknipe2733]

You explain exceptionally well, thanks.

[@SolidStateWorkshop]

Beautiful job. I liked the intuitive explanations. Thank you.

[@DarshanParajuli]

these magnetism vids are super helpful!!!

[@MrNaufan]

5:00 I have a question. Why the distance in the I2 equation doesn't multiply by 2 pi?

[@فيديوهاتتوعية-ر1ه]

isn't it a mistake by the teacher? he forgot to add it?

[@MrNaufan]

@@فيديوهاتتوعية-ر1ه I guess so

[@troiboieverson6100]

Thank you for this video, it cleared up a lot.

[@Blanco2015]

At 5:07, I think the current in one of the wires shld be in the opposite direction in order for the magnetic fields to be added together.

[@nooralmubarak5164]

Thanks ! You helped me I’m participating in the IJSO2019 From Qatar

[@thomasmerrill7470]

In your last example with the two wires, one going into the page and one coming out of the page, why would they repel each other. using the right hand rule, I get the force generated by the mag field at one wire, by the other wire, is toward the wire creating that mag field. Would that not mean attractive??

[@AlwinPaul18]

Hi Thanks for the video. I have a question. We have a length of wire connected as a loop in series to the secondary of a current injection transformer. So the current shall be travelling through two parallel wires in opposite direction (from transformer to wire and back to transformer). Can we deduce the magnitude of magnetic field around the two wires?

[@gadhajj9606]

at 7:50 you told that the current is going in to the page and out . Then the field will be in opposite directions and cancel out then right?

[@brianhan5181]

because the magnetic field is going into the page on each wires left side, and out of the page on each wires right side. so in the middle, you have one of the left and one on the right

[@calebsmit9731]

9:54 surely this expression for B1 is only true if b

[@aviralsohane1835]

THANKS I REALLY WANTED THIS. 👍👍👍👍🤗🤗 VERY NICE VIDEO....

[@coffee_bean__]

Is there a second video?

[@kryptynite76]

At 5:04 why is the distance you're dividing by for the second wire just d and not 2*pi*d?

[@TaeTae-bo9cv]

Hello! What if the currents have the same direction in this? What will happen to the magnetic field?

[@dillonberger4036]

at 8:29, index finger out of page, middle finger along r, and my thumb points to the right.. why did you draw B to the left?

[@donnal8683]

Where is the next video? are we using the cos theta for the angle? like when we calculate the electric field of the ring?

[@EmpyreanLightASMR]

Legend has it you're still waiting on an answer 😂 The second video is available (youtube sometimes removes links in comments, so I I'll link to it in a separate reply), but it's there. Anyway, he continues the problem and, no, you use sin theta (not cosine) and with some cool trig/algebra and substitution, basically theta goes away and you don't even have to worry about the angle any more.

[@EmpyreanLightASMR]

kzbin.info/www/bejne/hJengnmqjpahbqcsi=GRZ1nW2ZZLZG_eQq

[@teresachy]

why would one be going out of the page and the other into the page, since the current are both going downwards?

[@wms72]

Look at the current from d's point of view

[@pressnothingandwatch]

Why has every example on youtube or other source use the magical scenario where all components cancel out except for one? If the point isn't in the center of the two, what then?

[@instaminox]

this is a pure exam question. thanks

[@Sharingan5100]

For the field between 2 wires in the same direction at 6.43 : Is I one the greater magnitude? rather, how does one differentiate between the I1 and I 2 for subtraction purposes?

[@acepilot84]

Isn't the r value for the distance from the current to the point of interest squared? So why didn' t he square the sqrrt of a^2+b^2

[@anshul9856]

no. it's not, this is a different formula. Maybe instead of trying to find errors pay more attention

[@Agtsmirnoff]

What if the currents are in opposite directions?

[@alexapostolo3329]

Agtsmirnoff they repel

[@goldenraspberries713]

Are we supposed to account for the magnetic field of the Earth when doing these calculations? Why or why not?

[@KorePC]

+GoldenRaspberries I think not because it is (relatively) super small? not 100% sure but that's what i think.

[@brianb2308]

Unless the problem states that you should, it's pointless. In some labs you can take that into account and try to angle whatever apparatus you are using a certain amount to have it line up with the magnetic field the apparatus is creating. That way you can add up the fields, but yeah the earth's magnetic field is relatively small to most of what you will work with in problems or labs.

[@mayurisothynathan4785]

thanks mr sharpie man you helped me so much

[@imbo483]

brilliant job

[@13originalgruber]

where is the other video?!

[@cheofusi3562]

Thanks men..but I'm sure you notice your mistake with the current direction of the second wire

[@yupignome]

I'm pretty sure he used Fleming's Left-Hand Rule for the second wire. Wink.

[@MsOrangePen]

wheres the next video :S?

[@kryptynite76]

I figured out B at point b from the information he left us. I can show you, if you want

[@jiayunxiao509]

The second formula may be wrong

[@vv655c]

think it's 2 pi d ,he probably made a mistake or sth

[@hardikvyas1948]

Suyang Chen u call 2pid or 2 pi r...they are just variables

[@vijaysinghchauhan7079]

he forgot to write 2pi with d i n the denominator

[@MrNaufan]

thanks

[@ibrahimalbeloushi9994]

thanks a looooooooooooooot

[@gulimkurmangazy8533]

legend

[@humbertosarmiento4638]

Excuse me, are you from the United States of America?

[@lasseviren1]

Yes I am.

[@humbertosarmiento4638]

@@lasseviren1 Thank you for your answer. I'm learning Physics and I'm trying to learn English (U.S.A.). I only speak Spanish

[@lasseviren1]

@@humbertosarmiento4638 All the best in your efforts to learn both English and Physics. You are an inspiration!

[@arunagupta2422]

Thankyouuuuuuuuu

[@Marrowmachines]

big up

[@danilotoapantabarahona7253]

sh sh sh sh sh sh amperian loops

[@maryamkijaji4210]

Hahahahah...camilo ;)

[@MarioFernandez-hx1cm]

Thanks